Stems ascending, much branched, (7-)15-20 cm tall, bristly. Lower stem leaves petiolate; upper leaves sessile, narrowly oblong to oblanceolate, 2-6.5 × 0.5-1.5 cm, short strigose and sparsely bristly, base attenuate, apex usually subacute, sometimes obtuse. Inflorescences racemelike, 2-8 cm; bracts leaflike, linear to narrowly so, 0.8-2.5 cm × 1-3 mm. Pedicel ca. 0.8 mm. Calyx ca. 1.6 mm, to ca. 4.5 mm in fruit, parted nearly to base; lobes triangular, hirsute outside. Corolla purple-blue or white, glabrous; tube ca. 1 mm; appendages low trapeziform, ca. 0.3 mm; limb 2-3 mm wide; lobes orbicular-ovate. Nutlets narrowly ovoid, 2-2.2 × ca. 1.2 mm, with few fine tubercles and short hairs; aperture triangular, 1.2-1.5 mm, membranous emergence inside margin, ca. 0.3 mm; attachment scar near base. Fl. Jun-Sep.
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